This article is not from a prepper or survivalist website but offers up a skill that all of us can appreciate. The process is actually a two parter. Its about harvesting rechargeable batteries from various electronics. This is a unique and highly effective skill of its own, for the prepper. The next skill set is to take these salvaged batteries and recharge them for future use. Knowing how to and having the tools to make this happen is very impressive and could serve many purposes in the collapsed world.
The best part about this article is that is design to explain. The process has pictures and step by step instructions. Its not the easiest thing to do but I imagine once you run through the process it gets simpler. One of the most exciting pieces is learning how to harvest batteries from places you may not no batteries are hiding.